| 摘要 |
<p>The invention provides an oil equalizing circuit for a freezing device having a plurality of compression mechanisms, which oil equalizing circuit is capable of improving the reliability of the feeding of oil to each compression mechanism. The group of compression mechanisms (11) of an air conditioner (1) consists mainly of a first, a second and a third compressor (21a-21c) and an oil equalizing circuit (42). The oil equalizing circuit (42) comprises a first, a second and a third oil separator (24a-24c) disposed on the delivery sides of the compressors (21a-21c), a first, a second and a third oil return pipe (25a-25c) connecting the oil separators (24a-24c) to the suction sides of the compressors (21a-21c), a communicating pipe (26) providing communication between the oil return pipes (25a-25c), a first, a second and a third oil on/off means (27a-27c) disposed downstream of the connections of the oil return pipes (25a-25c) with the communicating pipe (26), and a first, a second and a third pressure reducing means (28a-28c) disposed upstream of the connections of the oil return pipes (25a-25c) with the communicating pipe (26).</p> |
